ftruncate — truncate a file to a specified length
pthread_getconcurrency, pthread_setconcurrency — get and set the level of concurrency
endutxent, getutxent, getutxid, getutxline, pututxline, setutxent — user accounting database functions
getc_unlocked, getchar_unlocked, putc_unlocked, putchar_unlocked — stdio with explicit client locking
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